It's May, so the Spider Queen scenario which awards this item is active again in Legends of Norrath.
Also, it might be helpful to add a description of what it does to the main body of this page. I know it is explained here in the comments, but for the "at a glance" viewer, it could be helpful to make it easy to find.
This clickie can be used once every 20 hours. Rogues summon 3 bottles of Concentrated Chalandria's Bite (equivalent to Bite of the Shissar) appropriate to their level. Non-rogue characters will summon (non-concentrated) Chalandria's Bite (equivalent to Spider's Bite) appropriate to their level. Chalandria's Bite XVIII is the current max.